Samsung has set its foot in the 'curved screen' field already, and have successfully climbed to the top by releasing its current flagship- The S6 Edge, featuring the world's first curved screens on both of its edges.
The previous Note 4 Edge came with one-sided curved screen and S6 Edge showed up with its both sides bent, So it does make total sense to expect Samsung to be building its next device with three curved sides, no?
Whatever the case maybe, Samsung is rumored to bring its Note 5, latest successor of the Note family to feature a 5'9 inch 4K display with dual edge screen, just like its S6 Edge. The curved screen can be easily expected to be in such a top-notch device but putting a 4K display could bring heavy consequences. 4K displays are indeed beautiful to look at but in such devices with limited battery capacity, it is clearly inefficient. Cramming up almost 4000 horizontal pixels (3840 x 2160 pixels) in a 5'9 inch screen will definitely enhance the display quality with leaps and bounds but lighting up those many pixels is bound get heavy on the battery.
So Samsung will be rigorously working to lower down its battery usage. It has used its in-house produced Exynos SoC processor for its S6 models which is gentle on the battery compared to Snapdragon and things will be entirely different for the Note 5 it seems. It will be using a specially designed high-density EPOP memory (embedded package on package) which consists of 3 GB LPDDR3 DRAM, 32 GB eMMC (embedded multi-media card) and a controller. This will ultimately allow the device to be slimmer, more fast and snappier, enhancing its multitasking capability.

Samsung will start mass production of its first phone-bound 4K displays next August. It has been suggested that production will be quickly ramped up in order to get the Galaxy Note 5 in to retailers by October.

With that said, we assume it to be released around October or September.Chances are that it will be showed at the Berlin-based technical IFA event kicks off on the 4th day of September. So hang around until we get the latest news and rumors about the Note 5.